https://bugs.kde.org/show_bug.cgi?id=374502
Bug ID: 374502
Summary: Problem with transparent output rendering
Product: kdenlive
Version: git-master
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: Video Display & Export
Assignee: j...@kdenlive.org
Reporter: f.fredpe...@gmail.com
Target Milestone: ---
Created attachment 103168
--> https://bugs.kde.org/attachment.cgi?id=103168&action=edit
transparent image
I was previously using kdenlive 15.12.3 in Mint 18 (the standard depot version)
and was able to successfully export transparent tracks using codec ffv1 and
pix_fmt=bgra (I am doing live compositing with the resulting files…) Note
Display is correct
with current version 17.03.70 with melt 6.5.0 both compiled following the
guidelines https://community.kde.org/Kdenlive/Development/KF5 the ouput files
are not transparent altough the pix_fmt looks correct
To see the bug, use a fully transparent png (alpha=0 in the entire 1920x1080
image) import it in the timeline and then export using the following parametres
for the rendering profile
f=matroska acodec=pcm_s16le ac=2 vcodec=ffv1 aspect=%dar pix_fmt=bgra
the ouput mkv is not anymore tranparent.
This "bug" is also there in 16.12.0
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